Competition, hope this helps!
        
             
        
        
        
Answer: Try A if that is not correct than try B. hope this helps
Explanation:
 
        
                    
             
        
        
        
A region's photosynthetic productivity is influenced most significantly by : A. Availability of nutrients and amount of solar radiation
Photosynthetic productivity  cannot happen without enough nutrients and radiation. In this photosynthetic productivity, the plants will process the nutrients it gathered and process it into producing its own food
hope this helps
        
                    
             
        
        
        
Are you referring to land building (where when coral dies it contributes to reef) calcification (coral and other animals are calcifying due to pollution) or polyps (how coral grow)
        
             
        
        
        
Answer and Explanation:
The cell theory has 3 parts:
- All living things are made of cells.
- Cells come from preexisting cells.
- Cells are the basic units of life.
Since this looks like a multiple choice problem, look for any answer choice that matches one of the three parts listed above.
Hope this helps!